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Finding the Fourth Proportional to 128,497.70, 177,345.38 and 74,039.43

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Solution

The fourth proportional to 128,497.70, 177,345.38 and 74,039.43 is: 102,185.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,497.70 : 177,345.38 = 74,039.43 : x
  2. Step 2: Convert to fraction form
    128,497.70/177,345.38 = 74,039.43/x
  3. Step 3: Cross multiply
    128,497.70x = 177,345.38 × 74,039.43
  4. Step 4: Simplify right side
    128,497.70x = 13,130,550,810.66
  5. Step 5: Solve for x
    x = 13,130,550,810.66/128,497.70
  6. Step 6: Final answer
    x = 102,185.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.